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Weather & Climate in Ōamishirasato, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ōamishirasato enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 40°F in January while summers reach 75°F in July. The area gets 231 sunny days per year, above the national average. Annual precipitation totals 58.1 inches (wetter than the 38-inch national average). The city sits at an elevation of 23 feet.
Temperature
40°F Jan (5°C)
75°F Jul (24°C)
| Annual Average | 59.0°F |
| 9% above US avg | |
| January Average | 40°F (5°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 231 days/yr |
Geography
| Elevation | 23 ft (7 m) |
| Area | 151.4 sq mi (392.2 km²) |
| Population Density | 318/sq mi |
| Coordinates | 35.5118°N, 140.3526°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
3,104 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.9.
| Mar 11, 2011 | 47 km E of ?arai, Japan | M7.9 | 110 km | 43 km |
| May 7, 2008 | 78 km NE of Hasaki, Japan | M6.9 | 128 km | 27 km |
| Mar 11, 2011 | 81 km NE of Hasaki, Japan | M6.5 | 131 km | 7 km |
| Feb 20, 1990 | 28 km E of Shimoda, Japan | M6.4 | 134 km | 14 km |
| Jun 1, 1990 | near the east coast of Honshu, Japan | M6.3 | 2 km | 67 km |
| Mar 11, 2011 | 92 km ENE of Hasaki, Japan | M6.3 | 142 km | 21 km |
| Jun 3, 2000 | 6 km SE of Narut?, Japan | M6.2 | 11 km | 62 km |
| Apr 11, 2011 | 23 km SE of T?gane, Japan | M6.2 | 23 km | 15 km |
| Sep 11, 1996 | 23 km SSE of Hasaki, Japan | M6.2 | 54 km | 55 km |
| May 7, 2008 | 80 km NE of Hasaki, Japan | M6.2 | 131 km | 19 km |
| Apr 21, 2011 | 6 km WNW of T?gane, Japan | M6.2 | 9 km | 43 km |
| Nov 20, 1996 | 115 km SE of Katsuura, Japan | M6.1 | 147 km | 33 km |
| May 26, 2023 | 12 km SE of Narutō, Japan | M6.1 | 16 km | 42 km |
| Aug 5, 1990 | 43 km E of ?arai, Japan | M6.1 | 110 km | 27 km |
| Jun 5, 2012 | 75 km ESE of ?hara, Japan | M6.1 | 95 km | 15 km |
| Sep 15, 2011 | 68 km E of ?arai, Japan | M6.1 | 121 km | 28 km |
| Mar 13, 2011 | 72 km E of Hasaki, Japan | M6.1 | 119 km | 8 km |
| May 7, 2008 | 95 km ENE of Hasaki, Japan | M6.1 | 145 km | 23 km |
| Aug 6, 1991 | 19 km E of Hasaki, Japan | M6.0 | 67 km | 29 km |
| Mar 11, 2011 | 4 km ESE of Hasaki, Japan | M6.0 | 52 km | 48 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
43 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Halong | Category 3 | — | 288 km |
| 2025 | Nakri | Category 1 | — | 247 km |
| 2024 | Ampil | Category 3 | 98 mph | 154 km |
| 2024 | Jebi | Category 1 | 75 mph | 186 km |
| 2021 | Mindulle | Category 1 | 86 mph | 257 km |
| 2019 | Faxai | Category 4 | 98 mph | 32 km |
| 2019 | Hagibis | Category 2 | 92 mph | 87 km |
| 2018 | Jongdari | Category 2 | 86 mph | 189 km |
| 2018 | Shanshan | Category 1 | 81 mph | 104 km |
| 2016 | Mindulle | Category 1 | 75 mph | 156 km |
| 2016 | Lionrock | Category 1 | 81 mph | 208 km |
| 2014 | Phanfone | Category 1 | 75 mph | 190 km |
| 2011 | Roke | Category 1 | 92 mph | 113 km |
| 2009 | Krovanh | Category 1 | 69 mph | 228 km |
| 2007 | Fitow | Category 1 | 81 mph | 105 km |
| 2005 | Saola | Category 2 | 86 mph | 214 km |
| 2005 | Mawar | Category 2 | 86 mph | 22 km |
| 2004 | Ma-on | Category 4 | 92 mph | 51 km |
| 2003 | Choi-wan | Category 3 | 81 mph | 232 km |
| 2002 | Higos | Category 2 | 86 mph | 59 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
20 tsunamis recorded within 500 km. Highest wave on record: 13.0 m (43 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1923 | SAGAMI BAY | Earthquake | 13.0 m | 105,385 | 90 km |
| 1703 | OFF SW BOSO PENINSULA | Earthquake | 11.7 m | 5,233 | 103 km |
| 1677 | OFF SE. BOSO PENINSULA | Earthquake | 8.0 m | 500 | 119 km |
| 1495 | KAMAKURA, SAGAMI BAY, TOKAIDO | Earthquake | 5.0 m | 200 | 90 km |
| 1732 | KUJUKURI BEACH, JAPAN | Earthquake | 2.0 m | — | 53 km |
| 1670 | BOSO, JAPAN | Earthquake | 2.0 m | — | 59 km |
| 1433 | OFF IZU-OSHIMA | Earthquake | 2.0 m | — | 103 km |
| 1980 | HONSHU ISLAND | Earthquake | 0.6 m | — | 132 km |
| 1982 | IBARAKI, JAPAN | Earthquake | 0.4 m | — | 143 km |
| 1961 | KASHIMA, JAPAN | Earthquake | 0.4 m | — | 150 km |
| 1923 | KASHIMA, JAPAN | Earthquake | 0.4 m | — | 132 km |
| 1978 | TOKAIDO | Earthquake | 0.4 m | 25 | 127 km |
| 1923 | RYUKYU ISLANDS | Earthquake | 0.3 m | — | 69 km |
| 1896 | KASHIMA, JAPAN | Earthquake | 0.3 m | — | 124 km |
| 1990 | JAPAN | Earthquake | 0.2 m | — | 134 km |
| 1855 | TOKAIDO | Earthquake | — | 6,757 | 52 km |
| 1782 | ODAWARA, SAGAMI BAY | Eruption + Earthquake | — | — | 75 km |
| 1642 | BOSO, JAPAN | Earthquake | — | — | 41 km |
| 1633 | SAGAMI BAY | Earthquake | — | 150 | 110 km |
| 1602 | BOSO, JAPAN | Eruption + Earthquake | — | — | 48 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
15 volcanoes within 200 km. Closest: Izu-Oshima (124 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Izu-Oshima | Stratovolcano | 758 m (2,487 ft) | 1990 | 124 km |
| Hakoneyama | Complex | 1,438 m (4,718 ft) | 2015 | 125 km |
| Izu-Tobu | Pyroclastic cone(s) | 1,406 m (4,613 ft) | 1989 | 133 km |
| Toshima | Stratovolcano | 508 m (1,667 ft) | -4550 | 147 km |
| Fujisan | Stratovolcano | 3,776 m (12,388 ft) | 1708 | 148 km |
| Akagisan | Stratovolcano | 1,828 m (5,997 ft) | Unknown | 156 km |
| Niijima | Lava dome(s) | 432 m (1,417 ft) | 886 | 158 km |
| Nantaisan | Stratovolcano | 2,486 m (8,156 ft) | -9540 | 159 km |
| Omanago Group | Lava dome(s) | 2,341 m (7,680 ft) | -3050 | 162 km |
| Takaharayama | Stratovolcano | 1,795 m (5,889 ft) | -4570 | 163 km |
| Nikko-Shiranesan | Shield | 2,578 m (8,458 ft) | 1952 | 168 km |
| Harunasan | Stratovolcano | 1,449 m (4,754 ft) | 550 | 173 km |
| Miyakejima | Stratovolcano | 775 m (2,543 ft) | 2010 | 175 km |
| Kozushima | Lava dome(s) | 572 m (1,877 ft) | 838 | 181 km |
| Nasudake | Stratovolcano(es) | 1,915 m (6,283 ft) | 1963 | 183 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (5°C) | 2.2 in | Coldest, Driest |
| February | 42°F (5°C) | 3.1 in | |
| March | 47°F (8°C) | 4.6 in | |
| April | 57°F (14°C) | 4.8 in | |
| May | 64°F (18°C) | 4.9 in | |
| June | 69°F (21°C) | 6.6 in | |
| July | 75°F (24°C) | 4.8 in | |
| August | 79°F (26°C) | 5.1 in | Warmest |
| September | 73°F (23°C) | 7.9 in | Wettest |
| October | 64°F (18°C) | 7.6 in | |
| November | 54°F (12°C) | 4.2 in | |
| December | 45°F (7°C) | 2.2 in |
Ōamishirasato has a seasonal temperature swing of 38°F / from 40°F in January to 79°F in August. Total annual precipitation is 58.1 inches, with September being the wettest month (7.9") and January the driest (2.2").